You'll be 'blown away' by 'Stranger Things' season finale, says David Harbour

David Harbour says Season Five will start filming next year. Photo: Handout

For fans eagerly awaiting the Season Four finale of hit Netflix show Stranger Things, cast member David Harbour has a clear message: "You'll be blown away."

The sci-fi drama, set in the 1980s, returned in late May with a first volume of episodes showing a new supernatural horror emerging from the Upside Down alternate dimension and besetting the fictional Indiana town of Hawkins.